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(11) | EP 0 745 870 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Non-unique seismic lithologic inversion for subterranean modeling |
| (57) A method of modeling subsurface reservoir conditions deals with non-uniqueness of
seismic reflection signals with respect to reservoir conditions by proposing and then
comparing both seismic and lithologic data for forward model sites to select the most
likely model for each site. Forward modeling techniques are used to build a synthetic
seismic trace catalog, which includes a range of corresponding pseudo-logs for reservoir
characteristics that could reasonably exist within a defined region. Then each synthetic
seismic trace in the catalog is compared against every real seismic trace, and a number
(e.g., 10 to 50) of synthetic traces is selected for association with each real trace
that best match the real trace. Finally, the pseudo-logs corresponding to the number
of selected synthetic seismic traces for each forward model site are compared to the
pseudo-logs selected for adjacent sites to select the most lithologically coherent
pseudo-log at each site for use in generating a model display of reservoir characteristics. |